种植密度对豫中区小麦群体构建和光能资源利用的影响

于大田条件下，研究种植密度对半冬性小麦“周麦22”群体构建及光能利用率的影响。结果表明，不同种植密度对周麦22群体光能利用具有显著的调控效应，随种植密度增加，小麦群体、干物质积累量呈升高趋势，叶面积指数（LAI）先升后降，成穗率以270万hm^-2密度处理（D2）最高；D2处理的小麦LAI适宜，群体受光态势良好，较其他密度处理具有明显优势，最终产量和光能利用率最高。说明，在豫中地区周麦22密度270万hm^-2左右是高产创建的理想指标之一。

Effects of Planting Densities on Establishment and Radiation Resource Utilization of the Wheat Colony in Mid Henan Province

To investigate the establishment and radiation resource utilization of colony in different planting densities, the field experiment was carried out with half winter cultivar Zhoumai 22. The results demonstrated that planting density could exert influence on the light utilization significantly. With the increase of density, the number of wheat colony and accumulation of dry matter tended to increase accordingly. The LAI increased first and then decreased, the earing rate reached the highest at the density of 270×10⁴ basic seedlings per hectare (D2). The D2 treatment had the rational size of colony and leaf area index and had apparent advantages in light distribution. The quantity of dry matter in each stratum of single wheat plant presented the tendency of increasing and then decreasing, which showed its advantage and make the final output and light utilization rate higher than other density treatments significantly. The experiment made it clear that in Mid Henan province, the winter wheat had the best light distribution, assimilative capability and suitable dry matter accumulation.